Lake West Okoboji, freshwater snail distribution, ecology, Mollusca
The snails of Lake West Okoboji were collected at the same 53 stations, using the same techniques and with equivalent effort as in a study 20 years earlier. The total number of snails collected was very similar. The same 12 species are present. The relative densities of the 8 major species have shifted strikingly, with a decrease in the more pollution tolerant pulmonates and concomitant increase in the less tolerant gilled species. The number of species per station has increased throughout the lake. The decline in the gastropod fauna appears to have been halted, probably due to the completion of a sanitary system around the lake.
Proceedings of the Iowa Academy of Science
© Copyright 1982 by the Iowa Academy of Science, Inc.
Bovbjerg, Richard V.; Dusil, Roger L.; and Broer, Rebecca L.
"The Gastropods of Lake West Okoboji, Iowa, Twenty Years Later,"
Proceedings of the Iowa Academy of Science: Vol. 89:
, Article 8.
Available at: http://scholarworks.uni.edu/pias/vol89/iss2/8